Add Linux support for getting the thumbnail and wire into the switcher.

chrome/browser/renderer_host/backing_store_x.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/renderer_host/backing_store.h"
 
 #include <stdlib.h>
 #include <utility>
 
 #include "base/compiler_specific.h"
@@ skipping 295 matching lines @@
 
   PaintRect(process, bitmap, bitmap_rect);
 }
 
 void BackingStore::ShowRect(const gfx::Rect& rect, XID target) {
   XCopyArea(display_, pixmap_, target, static_cast<GC>(pixmap_gc_),
             rect.x(), rect.y(), rect.width(), rect.height(),
             rect.x(), rect.y());
 }
 
-SkBitmap* BackingStore::PaintRectToBitmap(const gfx::Rect& rect) {
+SkBitmap BackingStore::PaintRectToBitmap(const gfx::Rect& rect) {
   static const int kBytesPerPixel = 4;
 
   const int width = rect.width();
   const int height = rect.height();
   XImage* image = XGetImage(display_, pixmap_,
                             rect.x(), rect.y(),
                             width, height,
                             AllPlanes, ZPixmap);
+
+  SkBitmap bitmap;
+
   // TODO(jhawkins): Need to convert the image data if the image bits per pixel
   // is not 32.
   if (image->bits_per_pixel != 32) {
     XFree(image);
-    return NULL;
+    return bitmap;  // Return the empty bitmap to indicate failure.
   }
 
-  SkBitmap* bitmap = new SkBitmap();
-  bitmap->setConfig(SkBitmap::kARGB_8888_Config, width, height);
-  bitmap->allocPixels();
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
+  bitmap.allocPixels();
   unsigned char* bitmap_data =
-    reinterpret_cast<unsigned char*>(bitmap->getAddr32(0, 0));
+    reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0));
   memcpy(bitmap_data, image->data, width * height * kBytesPerPixel);
 
   XFree(image);
   return bitmap;
 }